Vacuum tank for liquid fuels



June 18, 1929. QSRUUD 1.717.853

VACUUM TANK FOR LIQUID FUELS Filed June 21, 1927 Patented June 18, 1929.-

i 1,717,853? UNITED STATES PATENT OFFICE.

OTTO SEVERIN BUUD, OF OSLO, NORWAY.

VACUUM TANK FOR LIQUID FUELS.

Application filed June 21, 1927, Serial No. 200,427, and in Great Britain July 9, 1926.

The present invention relates to an improved vacuum tank for liquid fuels, more particularly of the kind used in automobiles for transferring the oil fuel from the reservoir to the carburetter of the motor.

The object of the invention is to obtain a vacuum tank simple in its construction and safe in its working.

The main feature of the invention consists in a novel valve arrangement which is operated by a floating body in the suction chamber and controls on the one hand the outlet of the oil fuel from the suction chamber to the chamber from which the fuel passes to the carburettor of the motor and on the other hand the admission of atmospheric air to the suction chamber.

The valve controlling the admission of atmospheric air to the suction chamber is larger than the valve controlling the outlet of fuel to the chamber feeding thecarburetter. Owing to this arrangement the floating body will be lifted only after a tity of fuel has been fed into the suction chamber. At the samemoment as the air valve is lifted, the pressure counter-balancing the lifting force of the float ceases to act, so that the floating body will be instantly lifted a considerable height, and the outlet will be free so that the fuel will pass quickly to the feeding chamber, whereupon the valves are again closed.

The accompanying drawing shows by way of example one construction according to the invention in sectional elevation.

1 designates the shell of a tank which is provided with corrugations 2 in order to obtain the necessary strength without using thick plates. Between corrugations are placed fastening ribbons 3 for support of the device.

The tank is provided at its upper end with a cover 4c connected air tightly to the shell and at the lower end with a similar bottom 5. By means of an intermediate plate 6 inclined towards the central part the tank is divided into two chambers a suction chamher 7 and a feeding chamber 8.

The suction chamber is provided with a socket 9 which may be connected to a pipe leading to the oil reservoir and a socket 10 adapted to be connected to a suction pipe from the motor. In the chamber 8 a socket 11 is provided for connection of the said chamber with the carburetter. I

In the suction chamber is arranged a float tegral thereto.

considerable quan- 12 having at its central part a pipe 13 in- This pipe coacts at its upper end with a valve 14 seated in a cup 15 arranged in the cover and covered by a cap 16 having apertures 17 for allowing the air to pass freely into the cup. The valve 14 is by means of a bar 118 within the said pipe 13 connected to another valve 19 which is less than the valve 14 and is seated in a cup 20 integral to the intermediate wall 6. The float may be prevented from touching the in termediate wall by means of a rigid sleeve 21 having apertures 22 for allowing the fluid to pass freely into the cup 20.

23 designates a pipe for filling fluid fuel into the feeding chamber 8 and 23 a sleeve supported by arms 24, 25 and forming a guide for the float pipe 13.

The apparatus works in the manner:

Before starting the motor the feeding chamber 8 is filled with oil. fuel through the pipe 23. After starting the suction chamber 7 will be subjected to the suction action of the motor and oil pass from the oil reservoir to the said chamber. This oil fuel cannot pass to the feeding chamber owing to the fact that the valve 19 is closed and consequently the oil fuel will remain in the suction chamber.

The float 12 will now gradually be subjected to an increasing flotation force. How ever the air pressure on the upper valve 14 contacting with the upper end of the pipe 13 will prevent a lifting of the float 12 until a suflicient quantity of oil fuel has been collected in the suction chamber to overcome such air pressure on the large valve 14;. In this moment, that is, as soon as the air valve has lifted, the air pressure will cease suddenly so that the float owing to the great quantity of oil fuel accumulated will be subjected to a rapid upward motion. Simultaneously, the vacuum in the suction chamber, ceases so that the oil fuel ceases to pass to the suction chamber, and the bottom valve is fully opened so that the oil fuel will pass freely to the feeding chamber. When the suction chamber has been emptied to a certain degree, the valves will be closed again so that the working of the device may be repeated. The division wall is concave or inclined towards the outlet to the feeding chamber in order that the suction chamber may be self cleanmg.

It will be understood that the illustrated following and described construction is only an eX- ample of a suitable manner in which the invention may be performed and that details of construction may be varied without departing from the scope of the invention.

Claims:

1. In a vacuum tank for oil fuel a suction chamber, a feeding chamber, an intermediate wall inclined towards the central part, a cup connected to the said intermediate Wall, a supporting and guidin sleeve supported by the said intermediate wall, a float placed in the suction chamber, a pipe integral to the float, a rigid guide for the said pipe, an air valve at the upper part of the suction chamber controlled by the said float by means of the said pipe, an oil fuel valve at the lower part of the suction chamber, having less cross section than the air valve, a common Valve rod placed within the float pipe, a cup in the cover of the apparatus and a rigid pipe connecting the said cup with the feeding chamber.

2. A vacuum tank for oil fuel having a suction chamber, a feedingchamber, an intermediate wall separating said chambers, a float in the suction chamber, an upwardly opening air admission valve at the upper part of the suction chamber controlled by the said float, an upwardly opening oil fuel discharging valve at the lower part of the suction chamber of less cross section than the air valve, and means connecting the valves to each other and to the float.

In testimony whereof I aflix my signature.

OTTO SEVERIN RUU D. 

